CN114525391A - Production process of high-carbon tool steel cold-rolled coil - Google Patents

Production process of high-carbon tool steel cold-rolled coil Download PDF

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Publication number
CN114525391A
CN114525391A CN202210162125.9A CN202210162125A CN114525391A CN 114525391 A CN114525391 A CN 114525391A CN 202210162125 A CN202210162125 A CN 202210162125A CN 114525391 A CN114525391 A CN 114525391A
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cold
coil
rolled
steel
carbon tool
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CN114525391B (en
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曾斌
孙武厅
李谨
梁亮
梁浩
齐江华
郑灵科
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Lysteel Co Ltd
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Lysteel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention relates to the technical field of metal cold rolling, in particular to a production process of a high-carbon tool steel cold-rolled coil, which comprises the steps of pickling a high-carbon tool steel hot-rolled coil by a pickling line, spheroidizing annealing by a bell-type furnace, rolling the annealed steel coil by a five-rack or six-rack cold continuous rolling mill, coiling the rolled steel coil into a coil, and finally annealing by the bell-type furnace to form a cold-rolled finished coil; the pickling and cover annealing are produced in the form of strip coils of wide coils instead of narrow or wide coils, the production efficiency is high, the cost is low, the cold continuous rolling unit is continuously produced by a plurality of frames, the equipment precision is high, the roll shifting capability of working rolls is realized, and the high-quality cold-rolled wide coils can be produced at high efficiency and low cost. Compared with the traditional high-quality special steel cold rolling enterprises at home and abroad at present, the technology is used for producing high-end products such as high-carbon tool steel and the like, and can bring remarkable economic benefit.

Description

Production process of high-carbon tool steel cold-rolled coil
Technical Field
The invention relates to the technical field of metal cold rolling, in particular to a production process of a high-carbon tool steel cold-rolled coil.
Background
High carbon tool steels are steels with carbon contents generally above 0.65% used for manufacturing tools such as cutting tools, saw blades, measuring tools, etc. The high carbon tool steel has high strength and hardness due to the high carbon content and even the addition of alloy elements. Therefore, the traditional production flow of the high-carbon tool steel cold-rolled coil is produced by a single-stand and narrow-band mode, and the mode of the single-stand and wide-width plate coil is rarely adopted. At present, a process for producing medium carbon steel or high-carbon high-quality carbon structural steel by adopting a cold rolling continuous rolling unit is developed in the steel industry, but the carbon content and the alloy element content of high-carbon tool steel are higher than those of high-carbon high-quality carbon structural steel; the strength and the hardness are higher; the plasticity and the toughness are lower; the rolling property is worse, so that the cold continuous rolling mill set is rarely reported to produce high-carbon tool steel.
The invention is different from the high-carbon tool steel produced by the existing single-stand cold rolling narrow strip mill, and has the characteristics of more complex process flow, lower production efficiency and higher production cost.
Disclosure of Invention
The invention aims to provide a production process of a high-carbon tool steel cold-rolled coil, and aims to solve the technical problems that the existing cold-rolling process is difficult to be matched with a cold tandem mill unit to produce high-carbon tool steel, the process flow of a single-stand cold-rolling narrow-band rolling mill is complex, the production efficiency is low, and the production cost is high.
The purpose of the invention can be realized by the following technical scheme:
a technology for manufacturing the cold-rolled high-carbon tool steel plate includes such steps as pickling the hot-rolled high-carbon tool steel plate by pickling line, spheroidizing annealing in bell-type furnace, rolling the annealed steel plate by cold-continuous rolling machine, coiling, annealing in bell-type furnace to obtain cold-rolled finished plate,
the specific pickling process comprises the following steps: pickling the coiled sheet with hydrochloric acid, wherein the concentration of the acid solution is 12-18%, the temperature of the acid solution is 70-85 ℃, and the pickling speed is 50-120 m/min; rinsing the pickled coil with water at 60-80 ℃; drying the rinsed coil by hot air at the temperature of 120 ℃;
the specific process of spheroidizing annealing comprises the following steps: heating the plate coil from normal temperature to 200 ℃, heating to 400 ℃ at a heating speed of 60 ℃/h, preserving heat for 4 hours, heating to 700-750 ℃ at a heating speed of 60 ℃/h, and preserving heat for 10-20 hours; slowly cooling to 600 ℃ after heat preservation is finished, changing air cooling to 400 ℃, changing water cooling to 100 ℃ and discharging to obtain strip steel;
the specific process of the cold rolling comprises the following steps: the strip steel is processed by a withdrawal and straightening machine, and the elongation of the withdrawal and straightening machine is 1.5-2.5%; the cold rolling unit inlet section realizes the connection of front and rear band steels by laser welding; performing rough roller rolling on a cold rolling working roller, wherein the cold rolling reduction is 20-40%; rolling the strip steel in a roll shifting mode to obtain a steel coil;
the specific process of the bell-type furnace annealing is as follows: the steel coil is freely heated to 200 ℃ from normal temperature, then heated to 400 ℃ at the heating speed of 60 ℃/h and kept warm for 4 hours; heating to 650-700 ℃ at a speed of 60 ℃/h, and preserving heat for 10-20 h; slowly cooling to about 600 ℃ after the heat preservation is finished; air exchange and cooling to 400 ℃; and (5) changing water to 100 ℃ and discharging to obtain the high-carbon tool steel cold-rolled coil.
As a further scheme of the invention: the cold continuous rolling unit is produced by a plurality of frames continuously, and the number of the frames of the cold continuous rolling unit is 5-6.
As a further scheme of the invention: when the cold continuous rolling mill set rolls in a sequential roll shifting mode, except the last stand, other stands all adopt negative shifting, and the negative shifting value is set to be a certain value within 40-10 mm.
As a further scheme of the invention: when the racks with the negative shifting are used for rolling in a sequential shifting mode, the negative shifting value of the previous rack is larger than or equal to that of the back rack.
The invention has the beneficial effects that:
(1) according to the process, the plate coil is subjected to acid pickling on a pickling line firstly, then is subjected to bell-type furnace spheroidizing annealing, the annealed steel coil is rolled by a rack cold continuous rolling unit, the rolled steel coil is coiled into a coiling process flow, and the acid pickling and the bell-type annealing can be produced in a wide coil form instead of a strip coil form of a narrow-band or wide coil form through optimized process parameters obtained through experiments in the process flow, so that the production efficiency is improved; and furthermore, the cold continuous rolling unit can carry out multi-frame continuous production on the wide steel plate, and the high-quality cold-rolled wide plate coil can be produced efficiently at low cost by matching with the roll shifting capacity of the working rolls, so that the economic benefit is improved.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the production process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention relates to a process for producing a high-carbon tool steel cold-rolled coil, which comprises the steps of pickling a high-carbon tool steel hot-rolled coil by a pickling line, spheroidizing annealing by a bell-type furnace, rolling the annealed steel coil by a frame cold continuous rolling unit, coiling the rolled steel coil into a coil, and annealing by the bell-type furnace to obtain a cold-rolled product.
The high-carbon tool steel has higher carbon content and alloy element content, so the corresponding strength and hardness are higher, and the high-carbon tool steel is more suitable for manufacturing tools such as cutting tools, saw blades and saw blades of saw blades, measuring tools and the like, but the high strength and the high hardness correspond to lower plasticity and toughness.
In actual processing, wider plate coils mean higher mechanical load, higher difficulty, the traditional processing generally needs to improve the mechanical load, and the processing cost is increased to ensure that the steel coils can be processed better.
The invention has another outstanding effect that the steel coil after the acid washing and spheroidizing annealing process can be continuously produced by the cold continuous rolling mill set in multiple frames, on one hand, the reason is the maintenance of the plasticity and the toughness of the processed steel coil, on the other hand, the reason is the process and the parameter setting of the multiple frame sets, when the steel coil just enters the cold rolling process, the load of the steel coil is low, and the processing performance is best, so the front frame working roll of the invention is set with a higher negative channeling value, meanwhile, the working rolls of the invention are arranged at the upper side and the lower side, the steel coil is rolled from the upper working roll and the lower working roll during the cold rolling process, the steel coil is hardened along with the cold rolling process, the processing performance is reduced, if the initial cold rolling processing parameters are continuously maintained, the great load is brought to the machine, and the processing process parameters of the rear frame of the invention are slowly reduced, the effect of the last frame is not the cold rolling effect, and the surface of the cold-rolled steel coil tends to be smooth, so that the impurity load balance of the steel coil is realized.
The roll shifting mode of the cold rolling working roll is negative shifting, and the working principle of the cold rolling working roll is that the axial movement directions of the upper working roll and the lower working roll are opposite, so that the steel coil is processed.
Exemplary embodiment 1: production of 75Cr1 cold-rolled sheet coil
Selecting a hot-rolled steel coil with the steel grade of 75Cr1 as a raw material, wherein the specification of the raw material is 2.5mm multiplied by 1250mm, and the chemical components are C and 0.76%; si, 0.25%; mn, 0.73%; 0.45 percent of Cr; 0.023 percent of Al; the balance of Fe and indispensable residual or impurity elements, and the specification of the finished product after cold rolling is 1.75 multiplied by 1250 mm. The method comprises the following steps:
pickling a hot rolled steel coil with hydrochloric acid, wherein the concentration of the acid solution is 15%, and the temperature of the acid solution is 82 ℃; rinsing with water at 70 ℃; the rinsed strip steel is dried by hot air at the temperature of 118 ℃. The pickling rate was 120 m/min.
Freely heating the pickled steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; then heating to 710 ℃ at the speed of 60 ℃/h, and preserving the heat for 10 h; slowly cooling to 620 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging.
The cold rolling is produced by adopting a five-stand continuous rolling mill, and the elongation of a cold rolling withdrawal and straightening machine is set to be 2.2 percent; laser welding; performing rough roller rolling on a cold rolling working roller; cold rolling reduction of 30 percent; roll shifting values of F1-F5 were set to 40mm, 30mm, 20mm, 10mm, and 0mm, respectively, by roll shifting mode rolling.
Performing bell-type furnace annealing on the cold-rolled steel coil, and freely heating the steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 700 ℃ at the speed of 60 ℃/h, and preserving heat for 10 h; slowly cooling to 620 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging. After annealing, 75Cr1 cold-rolled finished coils with the specification of 1.75 multiplied by 1250mm are produced, the thickness precision is +/-10 mu m, and the convexity C40 is within 6 mu m.
Exemplary embodiment 2: production of SK85 cold-rolled sheet coil
Selecting a hot-rolled steel coil with the steel grade of SK85 as a raw material, wherein the specification of the raw material is 2.8mm multiplied by 1250mm, and the chemical components are C and 0.84%; si, 0.22%; 0.45 percent of Mn; 0.18 percent of Cr; al, 0.019%; the balance of Fe and indispensable residual or impurity elements, and the specification of the finished product after cold rolling is 1.95 multiplied by 1250 mm. The method comprises the following steps:
pickling a hot rolled steel coil with hydrochloric acid, wherein the concentration of the acid solution is 14%, and the temperature of the acid solution is 81 ℃; rinsing with water at the rinsing temperature of 72 ℃; the rinsed strip steel is dried by hot air with the temperature of 123 ℃. The pickling rate was 120 m/min.
Freely heating the pickled steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 720 ℃ at the speed of 60 ℃/h, and preserving heat for 12 h; slowly cooling to 610 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging.
The cold rolling is produced by adopting a five-stand continuous rolling mill, and the elongation of a cold rolling withdrawal and straightening machine is set to be 2.2 percent; laser welding; performing rough roller rolling on a cold rolling working roller; cold rolling reduction of 30 percent; roll shifting values of F1-F5 were set to 40mm, 30mm, 20mm, 10mm, and 0mm, respectively, by roll shifting mode rolling.
Performing bell-type furnace annealing on the cold-rolled steel coil, and freely heating the steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 690 ℃ at the speed of 60 ℃/h, and preserving heat for 10 h; slowly cooling to 610 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging. After annealing, the SK85 cold-rolled finished product coil with the specification of 1.95 multiplied by 1250mm is produced, the thickness precision is +/-15 mu m, and the convexity C40 is within 7 mu m.
Exemplary embodiment 3: production of SK95 cold-rolled sheet coil
Selecting a hot-rolled steel coil with the steel grade SK95 as a raw material, wherein the specification of the raw material is 3.0mm multiplied by 1250mm, and the chemical components are C and 0.97%; si, 0.20%; mn, 0.43%; 0.21 percent of Cr; 0.017 percent of Al; the balance of Fe and indispensable residual or impurity elements, and the specification of the finished product after cold rolling is 2.25 multiplied by 1250 mm. The method comprises the following steps:
pickling a hot rolled steel coil with hydrochloric acid, wherein the concentration of the acid solution is 15 percent, and the temperature of the acid solution is 80 ℃; rinsing with water at the rinsing temperature of 71 ℃; the rinsed strip steel is dried by hot air at the temperature of 121 ℃. The pickling rate is 80 m/min.
Freely heating the pickled steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 750 ℃ at the speed of 60 ℃/h, and preserving heat for 12 h; slowly cooling to 600 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging.
The cold rolling is produced by adopting a five-stand continuous rolling mill, and the elongation of a cold rolling withdrawal and straightening machine is set to be 2.0 percent; laser welding; performing rough roll rolling on a cold rolling working roll; cold rolling reduction of 25%; roll shifting values of F1-F5 were set to 20mm, 10mm, and 0mm, respectively, by roll shifting mode rolling.
Performing bell-type furnace annealing on the cold-rolled steel coil, and freely heating the steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 720 ℃ at the speed of 60 ℃/h, and preserving heat for 10 h; slowly cooling to 600 ℃ after heat preservation is finished; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging. After annealing, SK95 cold-rolled finished coils with the specification of 2.25 x 1250mm are produced, the thickness precision is +/-20 mu m, and the convexity C40 is within 7 mu m.
Exemplary embodiment 4: production of 9SiCr cold-rolled sheet coil
Selecting a hot-rolled steel coil with the steel grade of 9SiCr as a raw material, wherein the specification of the raw material is 3.0mm multiplied by 1250mm, and the chemical components are C and 0.91%; si, 1.28%; mn, 0.46%; 1.08 percent of Cr; al, 0.037% and the balance Fe and indispensable residual or impurity elements, and the finished product specification is 2.35X 1250mm after cold rolling. The method comprises the following steps:
pickling a hot rolled steel coil with hydrochloric acid, wherein the concentration of the acid solution is 14%, and the temperature of the acid solution is 82 ℃; rinsing with water at 70 ℃; the rinsed strip steel is dried by hot air at the temperature of 121 ℃. The pickling rate was 50 m/min.
Freely heating the pickled steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 750 ℃ at the speed of 60 ℃/h, and preserving heat for 12 h; slowly cooling to 600 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) water cooling is carried out until the temperature is 100 ℃, and then the steel is discharged.
The cold rolling is produced by adopting a five-stand continuous rolling mill, and the elongation of a cold rolling withdrawal and straightening machine is set to be 2.0 percent; laser welding; performing rough roll rolling on a cold rolling working roll; cold rolling reduction of 22 percent; roll shifting values of F1-F5 were set to 40mm, 30mm, 20mm, 10mm, and 0mm, respectively, by roll shifting mode rolling.
Performing bell-type furnace annealing on the cold-rolled steel coil, and freely heating the steel coil to 200 ℃ from normal temperature; heating to 400 ℃ at the heating speed of 60 ℃/h and preserving heat for 4 hours; heating to 730 ℃ at the speed of 60 ℃/h, and preserving heat for 12 h; slowly cooling to 600 ℃ after heat preservation; air exchange and cooling to 400 ℃; and (5) changing water to be cooled to 100 ℃ and discharging. After annealing, 9SiCr cold-rolled finished coils with the specification of 2.35 multiplied by 1250mm are produced, the thickness precision is +/-20 mu m, and the convexity C40 is within 9 mu m.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (8)

1. A production process of a high-carbon tool steel cold-rolled coil is characterized in that a high-carbon tool steel hot-rolled coil is firstly pickled by a pickling line, and then is spheroidized and annealed by a bell-type furnace, the annealed coil is rolled by a rack cold continuous rolling unit, the rolled coil is coiled into a coil, and finally the coil is annealed by the bell-type furnace to form a cold-rolled finished coil.
2. The production process of the high-carbon tool steel cold-rolled coil as claimed in claim 1, wherein the pickling process comprises the following specific steps: pickling the coiled sheet with hydrochloric acid, wherein the concentration of the acid solution is 12-18%, the temperature of the acid solution is 70-85 ℃, and the pickling speed is 50-120 m/min; rinsing the pickled coil with water at 60-80 ℃; drying the rinsed coil by hot air at 120 ℃.
3. The production process of the high-carbon tool steel cold-rolled coil as claimed in claim 1, wherein the spheroidizing annealing comprises the following specific processes: heating the plate coil from normal temperature to 200 ℃, heating to 400 ℃ at a heating speed of 60 ℃/h, preserving heat for 4 hours, heating to 700-750 ℃ at a heating speed of 60 ℃/h, and preserving heat for 10-20 hours; and after the heat preservation is finished, slowly cooling to 600 ℃, changing air cooling to 400 ℃, changing water cooling to 100 ℃ and discharging to obtain the strip steel.
4. The production process of the high-carbon tool steel cold-rolled coil as claimed in claim 1, wherein the specific process of cold rolling is as follows: the tension leveler is used for processing the strip steel, and the elongation percentage of the tension leveler is 1.5-2.5%; the cold rolling unit inlet section realizes the connection of front and rear band steels by laser welding; performing rough roller rolling on a cold rolling working roller, wherein the cold rolling reduction is 20-40%; and rolling the strip steel in a roll shifting mode to obtain a steel coil.
5. The production process of the high-carbon tool steel cold-rolled coil plate according to claim 1, wherein the specific process of the bell-type furnace annealing is as follows: the steel coil is freely heated to 200 ℃ from normal temperature, then heated to 400 ℃ at the heating speed of 60 ℃/h and kept warm for 4 hours; heating to 650-700 ℃ at a speed of 60 ℃/h, and preserving heat for 10-20 h; slowly cooling to about 600 ℃ after the heat preservation is finished; air exchange and cooling to 400 ℃; and (5) cooling the steel plate to 100 ℃ by water, discharging the steel plate out of the furnace, and obtaining the high-carbon tool steel cold-rolled coil.
6. The process for producing high-carbon tool steel cold-rolled coils as claimed in claim 1, wherein the cold continuous rolling mill set is used for multi-stand continuous production, and the number of stands of the cold continuous rolling mill set is 5-6.
7. The production process of the high-carbon tool steel cold-rolled coil as claimed in claim 6, wherein when the cold continuous rolling mill set rolls in the sequential roll shifting mode, the other stands except the last stand adopt the negative shifting, and the negative shifting value is set to be within 40-10 mm.
8. The process for producing a high-carbon tool steel cold-rolled sheet according to claim 7, wherein when the machine frame with the run-negative effect is used for rolling in the sequential roll shifting mode, the run-negative effect of the former machine frame is greater than or equal to that of the latter machine frame.
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CN111676422A (en) * 2020-06-17 2020-09-18 苏州翔楼新材料股份有限公司 Cold-rolled high-carbon steel strip for V-saw blade matrix and production method thereof
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CN114058817A (en) * 2021-11-18 2022-02-18 包头钢铁（集团）有限责任公司 Production method of cold-rolled deep-drawing steel with thickness of 3.0mm

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